8ebb3eac02
The legacy PM is deprecated, so update a bunch of lit tests running opt to use the new PM syntax when specifying the pipeline. In this patch focus has been put on test cases for ConstantMerge, ConstraintElimination, CorrelatedValuePropagation, GlobalDCE, GlobalOpt, SCCP, TailCallElim and PredicateInfo. Differential Revision: https://reviews.llvm.org/D114516
59 lines
1.4 KiB
LLVM
59 lines
1.4 KiB
LLVM
; RUN: opt < %s -passes=sccp -S | FileCheck %s
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; This is a basic correctness check for constant propagation. The add
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; instruction should be eliminated.
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define i32 @test1(i1 %B) {
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br i1 %B, label %BB1, label %BB2
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BB1: ; preds = %0
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%Val = add i32 0, 0 ; <i32> [#uses=1]
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br label %BB3
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BB2: ; preds = %0
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br label %BB3
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BB3: ; preds = %BB2, %BB1
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%Ret = phi i32 [ %Val, %BB1 ], [ 1, %BB2 ] ; <i32> [#uses=1]
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ret i32 %Ret
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; CHECK-LABEL: @test1(
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; CHECK: %Ret = phi i32 [ 0, %BB1 ], [ 1, %BB2 ]
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}
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; This is the test case taken from appel's book that illustrates a hard case
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; that SCCP gets right.
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;
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define i32 @test2(i32 %i0, i32 %j0) {
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; CHECK-LABEL: @test2(
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BB1:
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br label %BB2
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BB2:
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%j2 = phi i32 [ %j4, %BB7 ], [ 1, %BB1 ]
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%k2 = phi i32 [ %k4, %BB7 ], [ 0, %BB1 ]
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%kcond = icmp slt i32 %k2, 100
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br i1 %kcond, label %BB3, label %BB4
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BB3:
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%jcond = icmp slt i32 %j2, 20
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br i1 %jcond, label %BB5, label %BB6
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; CHECK: BB3:
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; CHECK-NEXT: br i1 true, label %BB5, label %BB6
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BB4:
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ret i32 %j2
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; CHECK: BB4:
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; CHECK-NEXT: ret i32 1
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BB5:
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%k3 = add i32 %k2, 1
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br label %BB7
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BB6:
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%k5 = add i32 %k2, 1
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br label %BB7
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; CHECK: BB6:
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; CHECK-NEXT: br label %BB7
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BB7:
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%j4 = phi i32 [ 1, %BB5 ], [ %k2, %BB6 ]
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%k4 = phi i32 [ %k3, %BB5 ], [ %k5, %BB6 ]
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br label %BB2
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; CHECK: BB7:
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; CHECK-NEXT: %k4 = phi i32 [ %k3, %BB5 ], [ undef, %BB6 ]
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; CHECK-NEXT: br label %BB2
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}
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